EP1609916B1 - Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head - Google Patents

Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head Download PDF

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Publication number
EP1609916B1
EP1609916B1 EP05016382A EP05016382A EP1609916B1 EP 1609916 B1 EP1609916 B1 EP 1609916B1 EP 05016382 A EP05016382 A EP 05016382A EP 05016382 A EP05016382 A EP 05016382A EP 1609916 B1 EP1609916 B1 EP 1609916B1
Authority
EP
European Patent Office
Prior art keywords
drag head
jet pipes
series
visor
teeth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP05016382A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1609916A2 (en
EP1609916A3 (en
Inventor
Stefaan Vandycke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dredging International NV
Original Assignee
Dredging International NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dredging International NV filed Critical Dredging International NV
Publication of EP1609916A2 publication Critical patent/EP1609916A2/en
Publication of EP1609916A3 publication Critical patent/EP1609916A3/en
Application granted granted Critical
Publication of EP1609916B1 publication Critical patent/EP1609916B1/en
Priority to CY20091100199T priority Critical patent/CY1110897T1/el
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9256—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head
    • E02F3/9262—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with jets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
    • E02F5/104—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water
    • E02F5/108—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water using suction-effect devices

Definitions

  • the invention relates to a drag head for a trailing suction hopper dredger which essentially consists of a structure connected to a suction pipe, with a visor rotating around an horizontal axis, in which a series of teeth are applied for breaking up the sand, which are fitted on a toothed beam extending perpendicularly with reference to the direction of motion of the drag head, and a series of jet pipes for injecting water under high pressure, extending parallel to said toothed beam and in front of these teeth, always when considering the direction of motion of the drag head.
  • Such a drag head according to the preamble of claim 1 is known from GB-A-1.312.032 .
  • a hopper suction dredge is described which solves the problem of providing the means which allow carrying along a greater part of the coherent ground scraped off by the scraper of the hopper suction dredge in the suction current. This is done by increasing the suction pressure available for lifting the water/ground mixture by means of a hopper suction dredge comprising a suction mouth with a wall defining a chamber with an opening for connection to a suction pipe.
  • the suction mouth comprises a pivoted visor shaped flap to which a scraper blade lying outside the chamber is secured.
  • At least one nozzle is arranged for directing at least one water jet on material lying adjacent a second portion of the scraper blade inside the chamber, the flow direction of the jet being substantially parallel to the suction direction. In that way scraped off ground is crumbled by the water jets and sucked into the suction mouth.
  • a trailing suction hopper dredger consists of a structure connected to a suction pipe, which is open at the bottom side and is dragged over the ground during dredging.
  • the drag head itself consists of two parts: a cap which is directly connected to the suction pipe of the ship, and a visor which is hingingly connected to the cap by means of an horizontal axis.
  • a series of teeth 4 are applied on an horizontal beam in order to break up the ground.
  • Such a beam is known as a toothed beam.
  • a series of wear heel pieces are applied. These form the heel plate. In these wear heel pieces a number of nozzles are provided.
  • the sand to be dredged consists of piled up grains. By their own weight, these are pressed onto each other. This pressure is transferred between the grains by the mutual points of support, being the points of contact between the grains.
  • this equilibrium has to be disturbed. This may be achieved by using the jets: by feeding water under high pressure, the mutual pressure between the grains may be removed. By this, the force which keeps the grains on each other is removed, causing the grains to start moving. These grains try to reach another state of equilibrium, and this is called the fluidization of the sand. Now, only this sand has yet to be sucked up, which may be achieved by the underpressure built up in the drag head.
  • the jets serve to loosen up the sand and that the suction force of the dredging pump serves for the transport of the loosened up sand.
  • Trailing hoppers which correspond to the above given description are known.
  • a drag head according to claim 1 in which, behind the above said teeth, always with reference to the direction of motion of the drag head, at least one second series of jet pipes is provided.
  • the sand to be dredged consists of piled up grains which are pressed onto each other by their own weight.
  • the passage of the first series of jet pipes makes the grains up to a first depth come loose from each other and fluidizes the soil up to this first depth.
  • the passage of the teeth disturbs the soil up to the first depth, causing it to be sucked up.
  • the passage of the teeth breaks up the sand, i.e. makes the grains up to a second, increased depth come loose from each other, creating cavities and causing an underpressure in the soil up to this second depth.
  • JP60055133 a ditch excavation device is known, which employs a plurality of water jet nozzles mounted on a plurality of plow blades.
  • the plow of JP60055133 is used to make an underwater ditch for receiving cables, pipelines, and the like, and therefore simply pushes underwater ground material to the sides, i.e. away from the blades.
  • JP60055133 does not relate to a dredging drag head which, on the contrary, aims at collecting and sucking away underwater ground material through the suction pipe.
  • JP60055133 only teaches that excavation efficiency may be improved by employing water jets, however it does not teach that the use of a plurality of water jets actually improves the efficiency of sucking away ground material.
  • the above said second series of jet pipes is preferably subdivided in jet pipes directed at the inside of the visor, more particularly at above said teeth, and in jet pipes which are directed vertically or substantially vertically downwards.
  • the drag head for a trailing suction hopper dredger according to the invention is moved over the bottom in the direction of arrow P which is shown in figure 1 .
  • the drag head according to the invention is found at the end of a suction pipe 1 which is equipped with a visor 2 consisting a.o. of side walls 3, a back wall 3', a top plate 4 with an arc-shaped section 5, which upon rotation of the visor 2 around its axis 6 remains in close contact with the sealing strip 7 belonging to the fixed parts which are fitted to the suction pipe.
  • a visor 2 consisting a.o. of side walls 3, a back wall 3', a top plate 4 with an arc-shaped section 5, which upon rotation of the visor 2 around its axis 6 remains in close contact with the sealing strip 7 belonging to the fixed parts which are fitted to the suction pipe.
  • a second series of jet pipes is now provided. These jet pipes are subdivided into a first series of jet pipes 12 which are directed towards the teeth 10, and a second series of jet pipes 12' which are directed vertically or substantially vertically downwards.
  • the jets injected through jet pipes 12 are directed towards the inside of the visor.
  • the jet pipes 12' are aimed at fluidizing the bottom better, i.e. deeper at the height of the back wall 3'.
  • the different jet pipes 12, 12' immediately link up with a water valve 11 which may be moved, and this according to a translation which occurs in a plane that runs parallel to the back wall 3' of the visor.
  • This water valve 11 is designed in the shape of a water chamber 13. In case of hydraulic operation, this is carried out from the bridge of the trailing suction hopper dredger.
  • the fitting of the water valve which is adjustable in the height direction, increases the efficiency of the new drag head further, because the water gap may be optimally adjusted as a function of the soil conditions and totally independent from the penetration of the bottom by the visor.
  • the efficiency of the trailing suction hopper dredger is further increased by applying at the bottom of the side walls 3 of the visor, one or a series of several lateral knife-shaped wear strips 14. These wear strips are sufficiently thin to penetrate into the sand in order to realize the desired sealing, so that the ratio sand/water of the sucked off mixture is further optimized.
  • the drag head In order to prevent feed water from being fed along the relatively unproductive sides of the visor, the drag head has to be well sealed at these sites.
  • the side walls of the visor should well penetrate into the bottom.
  • the visor By the presence of thinly walled wear strips 14, the visor is laterally perfectly sealed, so that the required transport water is integrally sucked up at the back through the water gap and the agitated soil.
  • This new layout forms a second important feature of the invention.
  • a further improvement of the drag head should be seen in the presence at the back side of the drag head of the feet 15 hinging with respect to the visor, the useful surface of which, i.e. the base 15', is sufficiently great to guarantee a fixed support on the bottom.
  • the depth of the feet 15, which are mutually connected by a plate 17 ( figure 2 ) By regulating the depth of the feet 15, which are mutually connected by a plate 17 ( figure 2 ), the penetration of the visor and thus of the teeth into the soil is regulated. This allows to regulate the cutting thickness of the teeth and this independently from the water gap.
  • feet 15, with their widened bases 15' are rotatably fitted around hinge point 18. The rotation is effectuated by the action of the hydraulic cylinder 16, with hinge point 18 with respect to the feet 15 and hinge point 19 with respect to the visor.
  • the visor itself is lifted or lowered by the action of hydraulic cylinder 20.
  • the cylinder 20 is rigidly fastened with respect to the suction pipe 1 and is in 21 hingingly connected to fixed parts belonging to the structure of the visor, in order to lift or lower the back wall 3' thereof.
  • FIG 2 one of the hydraulic cylinders, 22, which controls the water valve 11, is shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Earth Drilling (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Manipulator (AREA)
  • Nozzles (AREA)
  • Shovels (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Hydraulic Turbines (AREA)
  • Coating Apparatus (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Soil Working Implements (AREA)
EP05016382A 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head Expired - Lifetime EP1609916B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CY20091100199T CY1110897T1 (el) 1997-07-17 2009-02-19 Κεφαλη ελξης για βυθοκορο με συρομενο καδο αναρροφησης και επεξεργασια για βυθοκορηση μεσω της εν λογω κεφαλης ελξης

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9700625 1997-07-17
BE9700625A BE1011285A3 (nl) 1997-07-17 1997-07-17 Sleepkop voor een sleephopperzuiger en werkwijze voor het baggeren met behulp van deze sleepkop.
EP98870161A EP0892116B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP98870161.1 Division 1998-07-17
EP98870161A Division EP0892116B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

Publications (3)

Publication Number Publication Date
EP1609916A2 EP1609916A2 (en) 2005-12-28
EP1609916A3 EP1609916A3 (en) 2006-04-05
EP1609916B1 true EP1609916B1 (en) 2008-11-26

Family

ID=3890649

Family Applications (2)

Application Number Title Priority Date Filing Date
EP98870161A Expired - Lifetime EP0892116B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head
EP05016382A Expired - Lifetime EP1609916B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP98870161A Expired - Lifetime EP0892116B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

Country Status (9)

Country Link
EP (2) EP0892116B1 (nl)
AT (1) ATE415524T1 (nl)
BE (1) BE1011285A3 (nl)
CY (1) CY1110897T1 (nl)
DE (2) DE69840281D1 (nl)
DK (2) DK0892116T3 (nl)
ES (2) ES2256926T3 (nl)
HK (1) HK1090398A1 (nl)
PT (2) PT1609916E (nl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110056031A (zh) * 2019-03-05 2019-07-26 中船第九设计研究院工程有限公司 一种耙吸挖泥船高压冲水***

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DE19960361A1 (de) * 1999-12-14 2001-06-21 Krupp Foerdertechnik Gmbh Schleppkopf für Saugbagger
NL1020521C2 (nl) * 2002-05-02 2003-11-04 Bos & Kalis Baggermaatsch Sleepzuiger en sleepkop daarvoor.
BE1015911A3 (nl) * 2004-02-19 2005-11-08 Dredeco Pty Ltd Sleepkop en hopperzuiger.
BE1016085A5 (nl) * 2004-06-23 2006-02-07 Dredging Int Sleepkop voor een sleephopperzuiger en werkwijze voor het baggeren met behulp van deze sleepkop.
EP1653010B1 (en) * 2004-10-26 2009-12-16 IHC Holland IE B.V. Method for performing an underwater dredging operation, and dredging installation
BE1017861A3 (nl) * 2007-11-29 2009-09-01 Dredging Int Sleepkop van een sleephopperzuiger en werkwijze voor het baggeren met behulp van deze sleepkop.
BE1018378A3 (nl) 2008-12-12 2010-09-07 Dredging Int Sleepkop voor een sleephopperzuiger en werkwijze voor het baggeren met behulp van deze sleepkop.
BE1018582A3 (nl) 2009-01-10 2011-04-05 Dredging Int Ontgraafinrichting voor het ontgraven van grond onder water en werkwijze voor het ontgraven van grond.
BE1019788A4 (nl) * 2011-02-02 2012-12-04 Baggerwerken Decloedt & Zn N V Zuigkop voor een baggerschip en werkwijze voor het baggeren met behulp van deze zuigkop.
CN102330443A (zh) * 2011-07-14 2012-01-25 中交天津港航勘察设计研究院有限公司 一种耙吸挖泥船用粘土耙头
BE1020372A5 (nl) 2012-01-16 2013-08-06 Baggerwerken Decloedt En Zoon Zuigkop voor een baggerschip en werkwijze voor het baggeren met behulp van zuigkop.
BE1020438A4 (nl) * 2012-05-21 2013-10-01 Baggerwerken Decloedt En Zoon Zuigkop voor een baggerschip en werkwijze voor het baggeren met behulp van deze zuigkop.
BE1020439A4 (nl) 2012-05-25 2013-10-01 Baggerwerken Decloedt En Zoon Zuigkop van een sleephopperzuiger en werkwijze voor het baggeren met behulp van deze zuigkop.
CN103195119A (zh) * 2013-03-29 2013-07-10 武汉武船海洋工程船舶设计有限公司 一种小型主动耙头
NL2011961C2 (en) * 2013-12-13 2015-06-16 Ihc Holland Ie Bv Modular visor for a drag head.
BE1022377B1 (nl) 2015-02-18 2016-03-18 Baggerwerken Decloedt En Zoon N.V. Zuigkop van een baggerschip en werkwijze voor het baggeren met behulp van deze zuigkop
CN104818739A (zh) * 2015-05-05 2015-08-05 明光市留香泵业有限公司 海底吸沙作业专用抽吸盾头
CN106193157B (zh) * 2016-08-31 2018-08-28 中交烟台环保疏浚有限公司 耙吸挖泥船用耙头
CN106677240A (zh) * 2016-11-22 2017-05-17 中交疏浚技术装备国家工程研究中心有限公司 一种用于疏浚饱和密实粉细砂与粉土的方法
CN106836342A (zh) * 2017-01-24 2017-06-13 黄河水利委员会黄河水利科学研究院 一种破土射流冲吸式吸泥头
NL2019109B1 (en) 2017-06-22 2019-01-07 Boskalis Bv Baggermaatschappij Trailing suction hopper dredger having a recycle system for effluent and method for suction dredging
CN107165216A (zh) * 2017-07-18 2017-09-15 中港疏浚有限公司 高压冲水耙头
CN108265767A (zh) * 2018-04-04 2018-07-10 长江南京航道工程局 挖泥船破碎耙头装置
CN108396807A (zh) * 2018-04-04 2018-08-14 长江南京航道工程局 挖泥船水翼耙头装置
CN108331060A (zh) * 2018-04-04 2018-07-27 长江南京航道工程局 挖泥船水刀耙头装置
CN108824532B (zh) * 2018-07-05 2023-07-11 长江南京航道工程局 一种自动调节转动角的自航耙吸式挖泥船耙头
CN109629622B (zh) * 2019-01-10 2023-12-08 中交上海航道局有限公司 一种耙吸式挖泥船耙头
CN109914505A (zh) * 2019-04-12 2019-06-21 中交天航滨海环保浚航工程有限公司 带有可拆卸格栅的耙吸挖泥船耙头结构
CN111395434B (zh) * 2020-04-20 2022-03-18 中交疏浚技术装备国家工程研究中心有限公司 耙吸挖泥船
CN111395433B (zh) * 2020-04-20 2022-04-26 中交疏浚技术装备国家工程研究中心有限公司 新型一体式高效耙头
CN111472405B (zh) * 2020-05-11 2020-11-24 日照市东港区水务集团有限公司 一种用于河床底部清理淤泥的机头
CN112575836A (zh) * 2020-12-03 2021-03-30 浙江理工大学 空化射流淤泥清理装置
CN113638457B (zh) * 2021-07-28 2022-09-16 江苏佳佩环保机械设备有限公司 一种耙吸式挖泥船用耙头

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110056031A (zh) * 2019-03-05 2019-07-26 中船第九设计研究院工程有限公司 一种耙吸挖泥船高压冲水***

Also Published As

Publication number Publication date
DK1609916T3 (da) 2009-03-16
ES2319781T3 (es) 2009-05-12
ES2256926T3 (es) 2006-07-16
DE69840281D1 (de) 2009-01-08
EP1609916A2 (en) 2005-12-28
PT892116E (pt) 2006-06-30
CY1110897T1 (el) 2015-06-10
DK0892116T3 (da) 2006-05-22
HK1090398A1 (en) 2006-12-22
EP0892116A1 (en) 1999-01-20
EP1609916A3 (en) 2006-04-05
BE1011285A3 (nl) 1999-07-06
DE69833248T2 (de) 2006-11-02
EP0892116B1 (en) 2006-01-18
ATE415524T1 (de) 2008-12-15
PT1609916E (pt) 2009-03-05
DE69833248D1 (de) 2006-04-06

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